sin(a+60)-sina=3/5,-90
已知sin(a+60)+sina=-(4根3)/5,-90
已知sin(a+60°)+sina=-4√3/5,-90°
sin(a-pia/4)=3/5,求sina
sin(3π-a)=sina?
已知3SIN^2A+2SIN^2B=5SINA,求SIN^2A+SIN^2B范围
若sinA+cosA/sinA-cosA=2,则sin(A-5π)*sin(3π/2-A)等于?
若(sina+cosa)/(sina-cosa)=2,则sin(a-5pai)*sin(3pai/2-a)等于?
若(sina+cosa)/(sina-cosa)=2,则sin(a-5派)*sin(3派/2-a)等于?
证明:[sin(a-60)]^2+[sina]^2+[sin(a+60)]^2=3/2
已知sin=-3/5,那么(cosa+sina/cosa-sina)+(cosa-sina/cosa+sina)
sinA+sin(120-A)=3/2 求A度数
已知sina+3cosa/3cosa-sina=5,则sin²a-sinacosa的值是